Does this study about the 42 elementary English sound bring us further? F. e. in the (classification) rubrication of the vowel sounds.
The document is larger than 2 mb so I can’t upload it.
https://www.dropbox.com/s/mk5l1yuy9n4nhmj/42%20english%20sounds.png?dl=0
out:
SEVEN THOUSAND WORDS OFTE N MISPRONOUNCED A COMPLETE HAN DBOOK OF DIFFICU LTI ES I N ENGLISH PRONUNCIATION INCLUDING AN UNU UA LLY LARGE NUMBER OF PROPER NAMES AND WORDS AND PHRASES FROM FOREIGN LANGUAGES
by
WILLIAM HENRY P. PHYFE (1893)
Kind regards
Jan van den Heuvel